<?php

/**
 * @package dompdf
 * @link    http://www.dompdf.com/
 * @author  Benj Carson <benjcarson@digitaljunkies.ca>
 * @author  Fabien M�nager <fabien.menager@gmail.com>
 * @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
 * @version $Id: image_frame_reflower.cls.php 448 2011-11-13 13:00:03Z fabien.menager $
 */

/**
 * Image reflower class
 *
 * @access private
 * @package dompdf
 */
class Image_Frame_Reflower extends Frame_Reflower {

    function __construct(Image_Frame_Decorator $frame) {
        parent::__construct($frame);
    }

    function reflow(Frame_Decorator $block = null) {
        $this->_frame->position();

        //FLOAT
        //$frame = $this->_frame;
        //$page = $frame->get_root();
        //if (DOMPDF_ENABLE_CSS_FLOAT && $frame->get_style()->float !== "none" ) {
        //  $page->add_floating_frame($this);
        //}
        // Set the frame's width
        $this->get_min_max_width();

        if ($block) {
            $block->add_frame_to_line($this->_frame);
        }
    }

    function get_min_max_width() {
        if (DEBUGPNG) {
            // Determine the image's size. Time consuming. Only when really needed?
            list($img_width, $img_height) = dompdf_getimagesize($this->_frame->get_image_url());
            print "get_min_max_width() " .
                    $this->_frame->get_style()->width . ' ' .
                    $this->_frame->get_style()->height . ';' .
                    $this->_frame->get_parent()->get_style()->width . " " .
                    $this->_frame->get_parent()->get_style()->height . ";" .
                    $this->_frame->get_parent()->get_parent()->get_style()->width . ' ' .
                    $this->_frame->get_parent()->get_parent()->get_style()->height . ';' .
                    $img_width . ' ' .
                    $img_height . '|';
        }

        $style = $this->_frame->get_style();

        //own style auto or invalid value: use natural size in px
        //own style value: ignore suffix text including unit, use given number as px
        //own style %: walk up parent chain until found available space in pt; fill available space
        //
    //special ignored unit: e.g. 10ex: e treated as exponent; x ignored; 10e completely invalid ->like auto

        $width = ($style->width > 0 ? $style->width : 0);
        if (is_percent($width)) {
            $t = 0.0;
            for ($f = $this->_frame->get_parent(); $f; $f = $f->get_parent()) {
                $f_style = $f->get_style();
                $t = $f_style->length_in_pt($f_style->width);
                if ($t != 0) {
                    break;
                }
            }
            $width = ((float) rtrim($width, "%") * $t) / 100; //maybe 0
        } elseif (!mb_strpos($width, 'pt')) {
            // Don't set image original size if "%" branch was 0 or size not given.
            // Otherwise aspect changed on %/auto combination for width/height
            // Resample according to px per inch
            // See also List_Bullet_Image_Frame_Decorator::__construct
            $width = $style->length_in_pt($width);
        }

        $height = ($style->height > 0 ? $style->height : 0);
        if (is_percent($height)) {
            $t = 0.0;
            for ($f = $this->_frame->get_parent(); $f; $f = $f->get_parent()) {
                $f_style = $f->get_style();
                $t = $f_style->length_in_pt($f_style->height);
                if ($t != 0) {
                    break;
                }
            }
            $height = ((float) rtrim($height, "%") * $t) / 100; //maybe 0
        } elseif (!mb_strpos($height, 'pt')) {
            // Don't set image original size if "%" branch was 0 or size not given.
            // Otherwise aspect changed on %/auto combination for width/height
            // Resample according to px per inch
            // See also List_Bullet_Image_Frame_Decorator::__construct
            $height = $style->length_in_pt($height);
        }

        if ($width == 0 || $height == 0) {
            // Determine the image's size. Time consuming. Only when really needed!
            list($img_width, $img_height) = dompdf_getimagesize($this->_frame->get_image_url());

            // don't treat 0 as error. Can be downscaled or can be catched elsewhere if image not readable.
            // Resample according to px per inch
            // See also List_Bullet_Image_Frame_Decorator::__construct
            if ($width == 0 && $height == 0) {
                $width = (float) ($img_width * 72) / DOMPDF_DPI;
                $height = (float) ($img_height * 72) / DOMPDF_DPI;
            } elseif ($height == 0 && $width != 0) {
                $height = ($width / $img_width) * $img_height; //keep aspect ratio
            } elseif ($width == 0 && $height != 0) {
                $width = ($height / $img_height) * $img_width; //keep aspect ratio
            }
        }

        if (DEBUGPNG)
            print $width . ' ' . $height . ';';

        $style->width = $width . "pt";
        $style->height = $height . "pt";

        return array($width, $width, "min" => $width, "max" => $width);
    }

}
